In a capacitor bank for power factor correction the automatic regulator
represents the real heart of the whole system. This image underlines the
importance of a device which must operate with the highest accuracy to
reduce stress and to increase the life of all components.
Automatic regulators from the ER series, combined with the contactors for
power factor correction, compose a unique product with high quality
standards. Gruppo Energia ER regulators are equipped with a digital
microprocessor and are suitable for the control of any type of power factor
correction system.
Data acquisition in rms guarantees accurate elaboration of the power to
correct.

CSC Capacitor Duty Contactors are specially designed to meet Capacitor
Duty application. Contactor are fitted with block of three early make auxiliary
contacts in series with quick discharge damping six - resistors - 2 per phase
to limit peak current to value within Contactor making capacity such that normal rated capacitor current is carried by main contacts which, after
closing, effectively short out the resistors.
During exact moment of switching, a capacitor effectively appears as short
circuit. The magnitude of capacitor in-rush or charging current will depend upon value of AC Voltage level at instant of switching, together with impedance of feeders cable & supply transformers.
In case of individual capacitors loads, charging current peaks of up to 30
times the rated capacitor current can occur. Whereas, for multi-stage
capacitor, the in-rush current greater than 180 times the rated capacitor
current can occur.
Such large-current can flow through contactor since initial in-rush current
is taken from both mains-supply & capacitor already connected. As in-rush current of such high magnitude is undesirable and likely to weld main contacts of Standard Duty Contactors.